My orthodontist included a bottle of Alightener Foam with my first set of Invisalign aligners. I use foam with Invisalign aligners every night. I don't notice any real difference in keeping my teeth white, but since it was recommended by my orthodontist, I use it religiously. Surprisingly, my foam ran out quicker than expected. It is best to buy at least two bottles at the beginning so that you can order more for the second bottle. So you don't suddenly run out of foam. And no, I do not work for a company that makes/sells Alightener foam. My advice is purely practical. If you're already spending a lot of money on Invisalign aligners, the added cost of the whitening foam doesn't make much of a financial difference.
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